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Eirikite

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Formula:
KNa6Be2(Si15Al3)O39F2
System:
Trigonal
Colour:
White to colorless
Hardness:
6
Member of:
Name:
Named after Eirik Raude (950-1003), discoverer of Greenland and father of Leiv (Leif) Eiriksson, after whom leifite is named.
Leifite Group.
The K analogue of leifite and telyushenkoite.

Classification of Eirikite

Approved 2007
9.EH.25

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
76.2.11.3

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
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First Recorded Occurrence of Eirikite

Year of Discovery:
1983
Geological Setting of First Recorded Material:
A nepheline-syenite pegmatite

Physical Properties of Eirikite

Silky
Colour:
White to colorless
Streak:
White
Hardness (Mohs):
6
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {100}
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.59 g/cm3 (Measured)    

Crystallography of Eirikite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Cell Parameters:
a = 14.3865Å, c = 4.8733Å
Ratio:
a:c = 1 : 0.339
Unit Cell Volume:
V 873.50 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.710 (29)
4.153 (21)
3.386 (70)
3.161 (100)
3.115 (17)
2.466 (31)
2.398 (19)
2.217 (20)

Chemical Properties of Eirikite

Formula:
KNa6Be2(Si15Al3)O39F2
Essential elements:
All elements listed in formula:

Relationship of Eirikite to other Species

Member of:
Other Members of Group:
Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2
Telyushenkoite(Cs,Na,K)Na6[F2|Be2Al3Si15O39]
9.EH.05ManganoneptuniteNa2KLi(Mn2+,Fe2+)2Ti2[Si8O24]
9.EH.05NeptuniteNa2KLi(Fe2+,Mn2+)2Ti2(Si8O24)
9.EH.05WatatsumiiteNa2KLi(Mn2+,Fe2+)2V24+[Si8O24]
9.EH.05MagnesioneptuniteKNa2Li(Mg,Fe)2Ti2Si8O24
9.EH.10GrumantiteNa(HSi2O5) · H2O
9.EH.15SarcoliteNa2Ca12(Ca,K,Fe,Sr,Mg)2Al8Si12(P,Si)O52F2
9.EH.20UssingiteNa2AlSi3O8OH
9.EH.25Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2
9.EH.25Telyushenkoite(Cs,Na,K)Na6[F2|Be2Al3Si15O39]
9.EH.30NafertisiteNa3(Fe2+)10Ti2(Si6O17)2O2(OH)6F(2H2O)2

Other Names for Eirikite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Eirikite

Reference List:
Larsen, A.O., Kolitsch, U., Gault, R.A., Giester, G. (2010): Eirikite, a new mineral species of the leifite group from the Langesundsfjord district, Norway. European Journal of Mineralogy, 22, 875-880.

Armstrong, J.A., Friis, H., Lieb, A., Finch, A.A., Weller, M.T. (2010): Combined single-crystal X-ray and neutron powder diffraction structure analysis exemplified through full structure determinations of framework and layer beryllate minerals. American Mineralogist, 95, 519-526. [refinement of Na-bearing leifite]

Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp [p 112-113]

HORVÁTH, L. (2009) Bertrandite, eirikite and a review of beryllium minerals from Mont Saint-Hilaire. MICRONEWS, 43(5), 9-12.

Internet Links for Eirikite

Localities for Eirikite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
LARSEN, A.O., KOLITSCH, U., GAULT, R.A. and GIESTER,G. (2010) Eirikite, a new mineral species of the leifite group from the Langesundsfjord district, Norway. European Journal of Mineralogy, 22, 875-880. Can. Museum of Nature & Horváth collections;
HORVÁTH, L. (2009) Bertrandite, eirikite and a review of beryllium minerals from Mont Saint-Hilaire. MICRONEWS, 43(5), 9-12.
Norway
 
  • Vestfold
    • Larvik
      • Langesundsfjorden
        • Vesle Arøya
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p: Larsen, A.O., Kolitsch, U., Gault, R.A. & Giester, G. (2010): Eirikite a new mineral species of the leifite group from the Langesundsfjord district, Norway. European Journal of Mineralogy. 22, 875–880
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Lovozero Massif
          • Alluaiv Mt
            • Umbozero mine (Umbozerskii mine; Umba Mine)
Pavel M. Kartashov data
Mineral and/or Locality  
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